Vol 7, No 2 (2016) > Mechanical Engineering >

Optimization of the Friction Factor and Frictional Pressure Drop of R22 and R290

Normah Ghazali, Qais Abid Yousif, Agus S. Pamitran, Sentot Novianto, Robiah Ahmad

 

Abstract:

Today, the air-conditioning and
refrigeration industry is still searching for environmentally friendly
refrigerants that could replace hazardous, ozone-depleting coolants –
refrigerants that behave similarly, if not better, than the present ones. The
present study examines optimization of the frictional pressure drop of R22 and
R290 using genetic algorithm. Outcomes are compared against the measured
pressure drop obtained from a horizontal 7.6 mm channel with a length of 1.07
meters. Three equations have been used for calculating the Darcy friction
factor and two-phase flow pressure drop for both laminar and turbulent flow
regimes in smooth and rough tubes. The effects of the different correlations
for the friction factor and pressure drop utilized are demonstrated. The
results illustrate that the differences between values of the Darcy friction
factor are very small for the two refrigerants examined, with the frictional
pressure of R-290 higher than R-22. Use of a smaller channel induced a much
higher frictional pressure drop, as well.

Keywords: Darcy friction factor; Genetic algorithm; Optimization; Pressure drop

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